<template>
  <!-- 面包屑导航栏 -->
  <el-breadcrumb separator-class="el-icon-arrow-right">
    <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
    <el-breadcrumb-item>商品管理</el-breadcrumb-item>
    <el-breadcrumb-item>添加商品</el-breadcrumb-item>
  </el-breadcrumb>

  <!-- 卡片视图 -->
  <el-card>
    <!-- 提示区域 -->
    <el-alert
      title="添加商品信息"
      type="info"
      center
      show-icon
      :closable="false"
    ></el-alert>

    <!-- 步骤条区域 -->
    <el-steps
      :space="200"
      :active="activeIndex - 0"
      finish-status="success"
      align-center
    >
      <el-step title="基本信息"></el-step>
      <el-step title="商品参数"></el-step>
      <el-step title="商品属性"></el-step>
      <el-step title="商品图片"></el-step>
      <el-step title="商品内容"></el-step>
      <el-step title="完成"></el-step>
    </el-steps>

    <!-- tab栏区域 -->
    <el-form
      ref="addFormRef"
      :model="addForm"
      :rules="addFormRules"
      label-width="100px"
      label-position="top"
    >
      <el-tabs
        modelValue="0"
        v-model="activeIndex"
        :tab-position="'left'"
        :before-leave="beforeTabLeave"
        @tab-click="tabClicked"
      >
        <el-tab-pane label="基本信息" name="0">
          <el-form-item label="商品名称" prop="goods_name">
            <el-input v-model="addForm.goods_name"></el-input>
          </el-form-item>
          <el-form-item label="商品价格" prop="goods_price">
            <el-input v-model="addForm.goods_price" type="number"></el-input>
          </el-form-item>
          <el-form-item label="商品重量" prop="goods_weight">
            <el-input v-model="addForm.goods_weight" type="number"></el-input>
          </el-form-item>
          <el-form-item label="商品数量" prop="goods_number">
            <el-input v-model="addForm.goods_number" type="number"></el-input>
          </el-form-item>
          <el-form-item label="商品分类" prop="goods_cat">
            <el-cascader
              :options="catelist"
              :props="cateProps"
              v-model="addForm.goods_cat"
              @change="handleChange"
            >
            </el-cascader>
          </el-form-item>
        </el-tab-pane>
        <el-tab-pane label="商品参数" name="1">
          <!-- 渲染表单的Item项 -->
          <el-form-item
            :label="item.attr_name"
            v-for="item in manyTableData"
            :key="item.attr_id"
          >
            <!-- 复选框组 -->
            <el-checkbox-group v-model="item.attr_vals">
              <el-checkbox
                :label="cb"
                v-for="(cb, i) in item.attr_vals"
                :key="i"
                border
              ></el-checkbox>
            </el-checkbox-group>
          </el-form-item>
        </el-tab-pane>
        <el-tab-pane label="商品属性" name="2">
          <el-form-item
            :label="item.attr_name"
            v-for="item in onlyTableData"
            :key="item.attr_id"
          >
            <el-input v-model="item.attr_vals"></el-input>
          </el-form-item>
        </el-tab-pane>
        <el-tab-pane label="商品图片" name="3">
          <!-- action 表示图片要上传到的后台API地址 -->
          <el-upload
            :action="uploadURL"
            :on-preview="handlePreview"
            :on-remove="handleRemove"
            list-type="picture"
            :headers="headerObj"
            :on-success="handleSuccess"
          >
            <el-button size="small" type="primary">点击上传</el-button>
          </el-upload>
        </el-tab-pane>
        <el-tab-pane label="商品内容" name="4">
          <!-- 富文本编辑器组件 -->
          <!-- <quill-editor v-model="addForm.goods_introduce"></quill-editor> -->
          <el-input v-model="addForm.goods_introduce" :rows="4" type="textarea">
          </el-input>
          <!-- 添加商品的按钮 -->
          <el-button type="primary" class="btnAdd" @click="add"
            >添加商品</el-button
          >
        </el-tab-pane>
      </el-tabs>

      <!-- 图片预览 -->
      <el-dialog title="图片预览" v-model="previewVisible" width="50%">
        <img :src="previewPath" alt="" class="previewImg" />
      </el-dialog>
    </el-form>
  </el-card>
</template>

<script>
import {
  computed,
  getCurrentInstance,
  onMounted,
  reactive,
  ref,
  toRefs,
  inject,
} from "vue";
import { useRouter } from "vue-router";
import _ from "lodash";

export default {
  setup() {
    // 获取vue实例
    const { proxy } = getCurrentInstance();
    // 获取路由
    const router = useRouter();
    // 注入一个axios
    const axios = inject("axios");

    // 完成索引
    let activeIndex = ref(0);

    // 表单元素
    let addFormRef = ref(null);

    // 添加商品的表单数据对象
    const addForm = reactive({
      goods_name: "",
      goods_price: 0,
      goods_weight: 0,
      goods_number: 0,
      // 商品所属的分类数组
      goods_cat: [],
      // 图片的数组
      pics: [],
      // 商品的详情描述
      goods_introduce: "",
      attrs: [],
    });
    // 表单校验规则
    const addFormRules = {
      goods_name: [
        { required: true, message: "请输入商品名称", trigger: "blur" },
      ],
      goods_price: [
        { required: true, message: "请输入商品价格", trigger: "blur" },
      ],
      goods_weight: [
        { required: true, message: "请输入商品重量", trigger: "blur" },
      ],
      goods_number: [
        { required: true, message: "请输入商品数量", trigger: "blur" },
      ],
      goods_cat: [
        { required: true, message: "请选择商品分类", trigger: "blur" },
      ],
    };

    // 商品分类列表
    const cate = reactive({
      catelist: [],
      cateProps: {
        label: "cat_name",
        value: "cat_id",
        children: "children",
        expandTrigger: "hover",
      },
      // 动态参数列表数据
      manyTableData: [],
      // 静态属性列表数据
      onlyTableData: [],
      // 上传图片的URL地址
      uploadURL: "http://127.0.0.1:8888/api/private/v1/upload",
      // 图片上传组件的headers请求头对象
      headerObj: {
        Authorization: window.sessionStorage.getItem("token"),
      },
      previewPath: "",
      previewVisible: false,
    });

    // 页面初始化请求数据
    const getGoodsList = async () => {
      const { data: res } = await axios.get("categories");
      if (res.meta.status !== 200)
        return proxy.$message.error("获取商品分类数据失败！");
      cate.catelist = res.data;
    };
    onMounted(() => {
      getGoodsList();
    });

    // 级联选择器选中项变化，会触发这个函数
    const handleChange = () => {
      if (addForm.goods_cat.length !== 3) {
        addForm.goods_cat = [];
      }
    };

    // 级联选择器选中项变化，会触发这个函数
    const beforeTabLeave = (activeName, oldActiveName) => {
      // console.log('即将离开的标签页名字是：' + oldActiveName)
      // console.log('即将进入的标签页名字是：' + activeName)
      if (oldActiveName === "0" && addForm.goods_cat.length !== 3) {
        proxy.$message.error("请先选择商品分类！");
        return false;
      }
    };

    // 级联选择器选中项变化，会触发这个函数
    const tabClicked = async () => {
      // 证明访问的是动态参数面板
      if (activeIndex.value === "1") {
        const { data: res } = await axios.get(
          `categories/${proxy.cateId}/attributes`,
          {
            params: { sel: "many" },
          }
        );

        if (res.meta.status !== 200) {
          return proxy.$message.error("获取动态参数列表失败！");
        }

        res.data.forEach((item) => {
          item.attr_vals =
            item.attr_vals.length === 0 ? [] : item.attr_vals.split(" ");
        });

        cate.manyTableData = res.data;
      } else if (activeIndex.value === "2") {
        const { data: res } = await axios.get(
          `categories/${proxy.cateId}/attributes`,
          {
            params: { sel: "only" },
          }
        );

        if (res.meta.status !== 200) {
          return proxy.$message.error("获取静态属性失败！");
        }

        cate.onlyTableData = res.data;
      }
    };

    // 处理图片预览效果
    const handlePreview = (file) => {
      cate.previewPath = file.response.data.url;
      cate.previewVisible = true;
    };

    // 处理移除图片的操作
    const handleRemove = (file) => {
      // 1. 获取将要删除的图片的临时路径
      const filePath = file.response.data.tmp_path;
      // 2. 从 pics 数组中，找到这个图片对应的索引值
      const i = addForm.pics.findIndex((x) => x.pic === filePath);
      // 3. 调用数组的 splice 方法，把图片信息对象，从 pics 数组中移除
      addForm.pics.splice(i, 1);
    };

    // 监听图片上传成功的事件
    const handleSuccess = (response) => {
      // 1. 拼接得到一个图片信息对象
      const picInfo = { pic: response.data.tmp_path };
      // 2. 将图片信息对象，push 到pics数组中
      addForm.pics.push(picInfo);
    };

    // 添加商品
    const add = () => {
      addFormRef.value.validate(async (valid) => {
        if (!valid) {
          return proxy.$message.error("请填写必要的表单项！");
        }
        // 执行添加的业务逻辑
        // lodash   cloneDeep(obj)
        const form = _.cloneDeep(addForm);
        form.goods_cat = form.goods_cat.join(",");
        // 处理动态参数
        cate.manyTableData.forEach((item) => {
          const newInfo = {
            attr_id: item.attr_id,
            attr_value: item.attr_vals.join(" "),
          };
          addForm.attrs.push(newInfo);
        });
        // 处理静态属性
        cate.onlyTableData.forEach((item) => {
          const newInfo = { attr_id: item.attr_id, attr_value: item.attr_vals };
          addForm.attrs.push(newInfo);
        });
        form.attrs = addForm.attrs;

        // 发起请求添加商品
        // 商品的名称，必须是唯一的
        const { data: res } = await axios.post("goods", form);

        if (res.meta.status !== 201) {
          return proxy.$message.error("添加商品失败！");
        }

        proxy.$message.success("添加商品成功！");
        router.push("/goods");
      });
    };

    // 当前选中的三级分类的Id
    const cateId = computed(() => {
      if (addForm.goods_cat.length === 3) {
        return addForm.goods_cat[2];
      }
      return null;
    });

    return {
      activeIndex,
      addFormRef,
      addForm,
      addFormRules,
      ...toRefs(cate),
      handleChange,
      beforeTabLeave,
      tabClicked,
      handlePreview,
      handleRemove,
      handleSuccess,
      add,
      cateId,
    };
  },
};
</script>

<style>
.el-checkbox {
  margin: 0 10px 0 0 !important;
}

.previewImg {
  width: 100%;
}

.btnAdd {
  margin-top: 15px;
}
</style>